Bad idea. Really, really, bad idea. Anything you say to them will, eventually, get back to your H. They are his family. You may be friends with them, but this is going to come back and bite you in the @$$...
Your expectations do affect what you do and what will happen. If you expect the D to go through, it will. If you expect he won't come home, he won't. Why? Because, even on a subconscious level, you alter your behavior.
And, sometimes, they do come home. Pride is, of course, and issue...but that's why you DB in order to create that "safe place" feeling.
He married you for a reason. He left because there were problems. Show him that it's possible to work through those problems, and that you won't hold a grudge, and he is likely to come back.
